{"cve":"CVE-2026-93798","nvd":{"published":"2026-09-24T17:17:12.607","modified":"2026-10-03T11:17:49.337","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix reloc root cleanup in merge_reloc_roots()\n\nIf the root we got has zero root refs in its root item, we are resetting\nthe root's ->reloc_root without using barriers like we do everywhere else.\nSashiko complained about this while reviewing another patch, and it's\ncorrect (see the Link tag below).\n\nAlso, we should not clear BTRFS_ROOT_DEAD_RELOC_TREE from the root unless\nthe root points to the reloc root we have.\n\nFix this by using clear_reloc_root(), which issues the memory barrier\nafter setting the root's ->reloc_root to NULL and before clearing the bit\nBTRFS_ROOT_DEAD_RELOC_TREE from the root.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://git.kernel.org/stable/c/0bc25f0a2d1b3e0a691431c4d7aef36afcd527c5","https://git.kernel.org/stable/c/29531470b1bf1e8bd2df4941fe913106edbca615","https://git.kernel.org/stable/c/415f8665a969d3c906e4fd7c90fcbb4b357886f6","https://git.kernel.org/stable/c/63d6b1f04cd91c825329712aa526215ffa5d11ca","https://git.kernel.org/stable/c/ab48583aa9948205ff9a6470e23dbff74c565e24"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:02.509636177+00:00"},"epss":{"cve":"CVE-2026-93798","score":0.00129,"percentile":0.02541,"date":"2026-10-26"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}